1992897228 has 90 divisors (see below), whose sum is σ = 5445491324. Its totient is φ = 567234192.

The previous prime is 1992897191. The next prime is 1992897229. The reversal of 1992897228 is 8227982991.

It is a super-2 number, since 2×1992897228² = 7943278722740167968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1992897229) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7577425 + ... + 7577687.

Almost surely, 2^1992897228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1992897228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2722745662).

1992897228 is an abundant number, since it is smaller than the sum of its proper divisors (3452594096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1992897228 is an frugal number, since it uses more digits than its factorization.

1992897228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 275 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 57.

The square root of 1992897228 is about 44641.8775142802. The cubic root of 1992897228 is about 1258.4277921265.

The spelling of 1992897228 in words is "one billion, nine hundred ninety-two million, eight hundred ninety-seven thousand, two hundred twenty-eight".